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Functions

Accessory position
the position of an ignition switch intended to permit the use of radio or other equipment without turning on a drive chain component.
Adjustable mortise cylinder
any mortise cylinder whose length can be adjusted for a better fit in doors of varying thickness.
Anti-friction
pertaining to a feature which, upon contact with the strike, allows smoother operation of a latch bolt.
Automatic deadbolt
a deadbolt designed to extend itself fully when the door is closed.
Automatic flush bolt
a flush bolt designed to extend itself when both leaves of the pair of doors are in the closed position.
Backcheck
the resistance provided by a door closer as a door is opened.
Ball locking
a method of locking a padlock shackle into its case using ball bearings as the bolts.
Bit
the part of the key which serves as the blade, usually for use in a warded or lever tumbler lock. May also mean to cut a key.
Build-up dimension
the distance between two different shear lines, as expressed in units of the manufacturer's increment or as an actual measurement. The dimension of the buildup pin required in a particular chamber which will allow one key to operate at the plug shear line and a different key to operate at a different shear line.
Change index
the point on a key changeable combination lock dial ring to which the old and new combinations must be dialed when changing the combination.
Combinate
to set a combination in a lock, cylinder, or key.
Combination
the group of numbers which represent the billing of a key and/or the tumblers of a lock or cylinder.
Compensate drivers
to select longer or shorter top pins, depending on the length of the rest of the pin stack, in order to achieve a uniform pin stack height.
Continuous duty
designed to sustain application of power for extended periods.
Control shear line
the shear line which allows operation of the control lug of an interchangeable or removable core.
Cross keying
the deliberate process of combinating a cylinder (usually in a master key system) to two or more different keys which would not normally be expected to operate it together.
Cross-bore
a hole drilled into the face of a door where a bored or interconnected lockset will be installed.
Curved lip strike
a strike so shaped as to effect smoother function of the latch while the door is closing.
Dog
to place an exit device in the hold-back mode. In marine applications the latch for a hatch.
Double pin
to place more than one master pin in a single pin chamber.
Dual custody
a function that requires the presence of two persons with two different keys, combinations or codes to operate the same device.
Dummy cylinder
a non-functional facsimile of a rim or mortise cylinder used for appearance only, usually to conceal a cylinder hole.
Duress code
a special combination or operation sequence which conveys an alarm or other signal to a remote location while allowing access.
Effective throw
the distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch.
End ward
a ward which prevents complete insertion and/or rotation of an incorrect key by forming an obstruction at the end of the key.
Fail safe
a feature of a security device designed to release, for safety purposes, during a power loss.
Fire exit hardware
exit devices which may legally be installed on fire doors. Distinguished from other exit devices because it is labeled for both fire and panic and has no means of locking the latch in a retracted position.
Full mortise
pertaining to a method of installation in which only the face plate and trim is exposed. The lock case is installed in a pocket in the door or drawer. To make a rectangular pocket in a door or drawer that is only open on the edge of the door or drawer.
Fusible link arm
a door closer arm which includes a mechanism for holding a door open. This mechanism has an element that when subjected to certain temperatures, melts and allows the door to close.
Gang lock
a locking mechanism with multiple bolts which locks different openings simultaneously by a single action.
Garage door lock
a rim lock mechanism designed for use on an overhead door, has a spring loaded bolt which automatically locks the door's bolt mechanism.
Gate
a notch cut into the edge of a tumbler to accept a fence or sidebar.
Guard bolt
a spring loaded bolt which, when activated, will deadlock a latch bolt.
Hand change
pertaining to a combination lock in which the wheels must be removed in order to change the combination
Handed
pertaining to hardware which is manufactured only for application on doors with a specific orientation.
Hardware schedule
a listing of the door hardware used on a particular job. It includes the types of hardware, manufacturers, locations, finishes, and sizes. It should include a keying schedule specifying how each locking device is to be keyed.
Hold open arm
a door closer arm with the capability of maintaining the door in the open position.
Hold open cylinder
a cylinder provided with a special cam which will hold a latch bolt in the retracted position when set that way by the key.
Holding fixture
a device which holds cylinder plugs, cylinders, housings, and/or cores to facilitate the installation of tumblers, springs and/or spring covers.
Hybrid locking system
a locking system which derives its security from two or more different technologies operated by the same key in one device, e.g. mechanical/electronic, mechanical, magnetic, etc.
Ignition key release
a button or other actuator which must be pushed before a vehicle's ignition key may be turned to the withdrawal position.
Impression
the mark made by a tumbler on its key cut or to fit a key by the impression technique.
Impression technique
a means of fitting a key directly to a locked cylinder by manipulating a blank in the keyway and cutting the blank where the tumblers have made marks.
Increment
a usually uniform increase or decrease in the successive depths of a key way which must be matched by a corresponding change in the tumblers.
Interconnected lockset
a lockset whose trim provides a means of simultaneous retraction of two or more bolts which may also be operated independently.
Interlocking bolt
a bolt which interlocks with its strike when fully engaged.
Interlocking pin tumbler
a type of pin tumbler which is designed to be linked together with all other tumblers in its chamber when the cylinder plug is in the locked position.
Jimmy proof
pertaining to a lock having a bolt which interlocks with its strike.
Key change
referring to a lock in which the combination can he changed through the use of a special key or tool without disassembling the lock.
Key control
any method or procedure which limits unauthorized acquisition of a key and/or controls distribution of authorized keys. A systematic organization of keys and key records.
Key override
a provision allowing interruption or circumvention of normal operation of a combination lock or electrical device. Of or pertaining to such a provision, as in "key override cylinder" key.
Key pulls
a lock specification which indicates by quantity and orientation the positions in which a key may be withdrawn.
Key retaining
of or pertaining to a lock which must be locked before its key can be removed. Pertaining to a cylinder or lock which may prevent removal of a key without the use of an additional key and/or tool.
Key symbol
a designation used for a key combination in the standard key coding system, e.g. A, AA, AAI, etc.
Key trap core/cylinder
a special core or cylinder designed to capture any key to which it is combinated, once that key is inserted and turned slightly.
Keyed
combinated or having provision for operation by key.
Keyed alike
of or pertaining to two or more locks or cylinders, each of which is or is to be combinated differently from the others. They may or may not be part of a keying system.
Keyed different
of or pertaining to a group of locks or cylinders, each of which is or is to be combinated differently from the others. They may or may nor be part of a locking system.
Keyed random
of or pertaining to a cylinder or group of cylinders selected from a limited inventory of different key changes. Duplicate billings may occur.
Keying symbol
a designation used for a lock or cylinder combination in the standard key coding system; e.g., AAI, XAAl, XIX, etc.
Latch
a mechanical device which automatically keeps a door closed until a deliberate action is used to retract it.
Latching speed (of a door closer)
the final speed of a door just prior to closing.
Lockout
any situation in which the normal operation of a lock or cylinder is prevented.
Magnetic contact
an electrical switch activated by magnetic attraction or repulsion.
Maison key system
[from the French meaning "house'' key system] a keying system in which one or more cylinders are operated by every key (or relatively large numbers of different keys) in the system; e.g., main entrances of apartment buildings operated by all individual suite keys of the building.
Man trap
a sally port designed for pedestrian traffic.
Master keyed
of or pertaining to a cylinder or group of cylinders which are or are to be combinated so that all may be operated by their own change keys and by additional keys known as master keys.
Negative locking
locking achieved solely by spring pressure or gravity which prevents a deep key cut from operating a lock or cylinder.
Non key retaining
of or pertaining to a lock whose key can be removed in both the locked and unlocked positions.
Non-fail safe
a feature of a security device designed to remain engaged, for security purposes during a power loss.
Non-handed
pertaining to hardware which is manufactured in a way which allows installation on doors of any orientation without requiring modification or adjustment to accommodate the door orientation.
Non-keyed
having no provision for key operation NOTE: This term also includes privacy function locksets operated by emergency key.
Open gated
pertaining to a lever tumble whose gate is in the edge of the tumbler.
Opening index
the index or mark to which a combination is dialed in order to effect an opening.
Operating shear line
any shear line which allows normal operation of a cylinder or lock.
Overhead stop
a door stop that contacts the door near the top.
Panic button
any switching device in an alarm system designed to be activated by a person in a panic situation. It creates an immediate alarm condition.
Paracentric
of or pertaining to a keyway with one or more wards on each side projecting beyond the vertical center line of the keyway to hinder picking. Of or pertaining to a key blank made to enter such a keyway.
Plunger lock
any of various spring-loaded locks or cylinders which move in or out to accomplish a locking function.
Pop out lock
a plunger lock usually used on vending machines to prevent operation of a T-handle.
Positive locking
the condition brought about when a key cut which is too high forces its tumbler into the locking position. This type or locking does not rely on gravity or spring pressure.
Power locks
electrically or electro-pneumatically operated locks.
Pullman keeper
a type of keeper which is shaped to operate with the radiused contour of a Pullman latch.
Pullman latch
a type of latch which pivots like a hinge and whose locking side is radiused.
Restricted
of or pertaining to a keyway and corresponding key blank whose sale and/or distribution is limited by the lock manufacturer in order to reduce unauthorized key proliferation.
Reversible
pertaining to hardware which is manufactured in a way which allows field assembly or adjustment to accommodate installation on doors with different orientations.
Screen door lock
a lock designed for the thin stiles typically found on screen and storm doors.
Series wafer
a type of disc tumbler used in certain binary type disc tumbler key-in-knob locks. Its presence requires that no cut be made in that position on the operating key.
Shunt switch
a maintained contact switch, often key operated.
Shut out model
the state of a hotel function lockset which prevents operation by all keys except the emergency master key, display key, and some types or shut out keys.
Shutter
a spring loaded device which closes upon the removal of a cylinder tailpiece, protecting a locking device from being manipulated. A key in the form of a sickle inserted through a hole in a door to actuate a bolt on the opposite side of the door.
Side ward cut
a cut made into a key to bypass a side ward.
Simultaneous retraction
a feature which allows retraction of both the deadbolt and latchbolt in the same operation.
Single cylinder
pertaining to a lock with key operation from only one side.
Slider
a tumbler which is normally flat, has a gate and moves with a linear or lateral motion instead of pivoting like a lever tumbler.
Split spindle
a multi-piece spindle which allows a knob or lever to be installed on only one side of a door.
Stepped tumbler
a special (usually disc) tumbler used in master keying. It has multiple bearing surfaces for blades of different key sections.
Stop (of a door)
the projecting portion of a door frame upon which the door rests when closed.
Stop works
a button or toggle mechanism which prevents operation of a knob, lever or thumbpiece in a non-bored lock.
Store door function
a lockset function where a deadbolt is operated by key from either side and a latch is operated by working trim from either side or a deadlocking latch that can be withdrawn by working trim from either side except when both sides are locked by key from either side.
Theoretical key changes
the total possible number of different combinations available for a specific cylinder or lock mechanism.
Three point latch
a self-latching device designed to latch a door at the top, bottom and edge.
Throat cut
the cut made into a key to bypass a throat ward.
Throw
the distance a bolt or latch projects from the faceplate or case of a lock in the extended position.
Throw member
an intermediate actuator which engages the rear of the plug to transfer motion to a cam, tailpiece or other actuator.
Thumbpiece
a generally flat, projecting latch actuator found above a grip handle and depressed by the thumb.
Tilt column
a steering column design which permits vertical adjustment of the steering wheel.
Tip stop
a type of stop located at or near the tip of the key.
Toggle
a pivoting one-piece stop works activator.
Touch bar
a type of exit device actuator which typically does not pivot and retracts the bolt with a minimum amount of pressure.
Zero bitted
of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number "0" bitting.